Brake-shoe.



No. 663,958. Patented Dec. |8,AI900.

J. n. cARnwELL.

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JAMES R. CARDWELL, OF CHICAGO, ILLINOIS.

BRAKE- SHOE.

SPECIFICATION forming part of Letters Patent No. 663,958, dated December 18, 1900.

Application filed August l0, 1899.

To all whom/ it ntcty concern.-

Be it known that I, JAMES R. CARDWELL, a citizen of the United States, and a resident of Chicago, Cook county, Illinois, have inventeda certain new and useful Improvement in- Brake-Shoes, (Case No. 2,) of which the, following, taken in connection with the accompanying drawings, is a specification.

My invention relates to that type of brakeshoe which employs an insert of white or hard cast-iron or other suitable material embedded in a casting of soft iron or other like material. If inserts of this kind are made of such a width as to cover the proper amount ofthe face of the shoe, the parts or walls of the body of the shoe which are at the sides and ends of the insert are necessarily rather thin. One result of this is that in service they are liable to be chipped out or broken.

One object of my invention is, broadly stated, to overcome the above-mentioned difculty, and this I do by constructing my insert with recesses arranged at intervals along the outer edge thereof adapted to receive a portion of the metal of the body of the shoe in such a manner as to form strengthening parts or buttresses for the thin outer portion of the shell.

Another feature of my invention is the construction of said recesses of such a shape as will form a dovetail opening with which the metal of the bodyof the shoe along the edge or side wall thereof will interlock, thereby greatly strengthening the construction of the shoe as a whole.

Another object of my invention is the provision of an insert for brake-shoes having a plurality of cellular openi ngs therein arranged with their aXes along parallel lines, so' that they may be readily drawn from the sand, and having the outer diameter or size-of the cel lular openings larger than the inner, so that as the metal of the body of the shoells the cells the insert will be securely and rigidly held in the shoe and serve to greatly strengthen the same. Y

The above, as well as such other objects as may hereinafter appear, I` attain by means of the construction shown in the accompanying drawings, in which- Figure l shows a face view of a brake-shoe insert constructed in accordance with my in- Serial No. 726,744. (No modela` vention, the outline of the body of the shoe' being indicated around the insert by dotted lines. Fig. 2 is a section through the insert, taken on the line 2 2 of Fig. l. Fig. 3 is a section on the line 3 3 of Fig. l. Fig. 4 is a view showing a part of a shoe having an insert provided with recesses on its edges andA buttresses for the walls of the shoe having dovetail engagement with the recesses; and Fig. 5 shows a portion of a shoe having a cellular insert made in accordance with my invention, the cells or chambers being of a different shape from those shown in the other views.

In the construction of my insert-plate 6 I form the openings or cells with the diameter or size of that part which is adjacent to the Vface of the shoe, as indicated at 7, considerably larger than the diameter or size of the bottom of the cellular openings, as indicated at 8. This, as clearly appears in Fig. 8, allows the metal body of the shoe to flow into the cells or chambers of the insert and forrnyg A a dovetail connection therewith, whereby-the strength of the insert is imparted to the shoe.

At intervals along the outerA edge of the insert I arrange recesses 9, partly to take away a certain portion of the wearing-face of the hard insert at the edge thereof and partly to permit the metal body of the shoe to flow into the recesses and form buttresses 10 therein, which greatly strengthen the side walls of the body of the shoe and prevent the breaking away thereof in service. As shown in the drawings, I also provide such buttress or supporting parts at the corners of `the insert and also at the ends.

In Fig. 4 I have shown an insert-plate without cellular openings, but provided with recesses along its edge, the recesses being set `in a sufficient distance or shaped in such a but somewhat elongated, and also provided with the buttress l0, arranged at intervals along the sides, corners, and ends.

Having thus described my invention, what with Cellular openings filled by the metal of the body of the shoe, said openings having axes extending along parallel lines substantially as speeied, whereby to facilitate the formation of the mold therefor.

JAMES R. CARDWELL.

In presence of* PAUL CARPENTER, PAUL SYNNESTVEDT. 

